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Issue 17, 2018
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Infrared laser dissociation of single megadalton polymer ions in a gated electrostatic ion trap: the added value of statistical analysis of individual events

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Abstract

In this study, we report the unimolecular dissociation mechanism of megadalton SO3-containing poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) polymer cations and anions with the aid of infrared multiphoton dissociation coupled to charge detection ion trap mass spectrometry. A gated electrostatic ion trap (“Benner trap”) is used to store and detect single gaseous polymer ions generated by positive and negative polarity in an electrospray ionization source. The trapped ions are then fragmented due to the sequential absorption of multiple infrared photons produced from a continuous-wave CO2 laser. Several fragmentation pathways having distinct signatures are observed. Highly charged parent ions characteristically adopt a distinctive “stair-case” pattern (assigned to the “fission” process) whereas low charge species take on a “funnel like” shape (assigned to the “evaporation” process). Also, the log–log plot of the dissociation rate constants as a function of laser intensity between PAMPS positive and negative ions is significantly different.

Graphical abstract: Infrared laser dissociation of single megadalton polymer ions in a gated electrostatic ion trap: the added value of statistical analysis of individual events

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Publication details

The article was received on 18 Jan 2018, accepted on 11 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP00404H
Citation: Phys. Chem. Chem. Phys., 2018,20, 11959-11966
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    Infrared laser dissociation of single megadalton polymer ions in a gated electrostatic ion trap: the added value of statistical analysis of individual events

    M. A. Halim, C. Clavier, X. Dagany, M. Kerleroux, P. Dugourd, R. C. Dunbar and R. Antoine, Phys. Chem. Chem. Phys., 2018, 20, 11959
    DOI: 10.1039/C8CP00404H

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